This is seriously entitled. Mozilla gave us an amazing resource, entirely for free. This attitude isn't right, it's toxic and harmful.
Mozilla is in a spot of difficulty, and instead of taking a resource that is operating entirely at a loss down, they're taking the engineering steps to ensure thez resource can outlive them.
That their mismanagement caused them the difficulty is entirely irrelevant here. It could have happened in a myriad of other ways. We should be praising Mozilla and the MDN tech team for the steps they're taking in making sure the MDN can live on.
Hint: it's less than $200.
Donations don't really work.
Just to be sure, are you referring to the "BuyMeCoffee" button on the GitHub page for the extension (https://github.com/VSCodeVim/Vim)?
That's what I expect of a non-profit organization dedicated to maintaining one of the last two remaining major browser engines, yes.
Now that antitrust is happening anyways, Google's main reason for shoveling money at them is going away.